Book Definition: Sudden loss of muscle control.

In Your Own Words

  • Cataplexy is a disease that causes spontaneous loss in muscle movement. Cataplexy tends to affect people or animals that have narcolepsy.
  • It can happen after a narcoleptic sleep attack.
  • Rare disease that affects roughly 70% of people with narcolepsy.


  • Cramps.
  • Impaired vision during attack.
  • Dropping of the head or jaw.
  • May cause knee buckling.
  • Drooping arms while walking.
  • Body Crashing.
  • Slumping of the shoulders.
  • Slurred speech.
  • May even pass out.
  • You're walking, and then all of a sudden your legs give out and you can't move them.

Additional Resources